JPH04283657A - Gas chromatograph/mass spectroscope - Google Patents

Abstract

PURPOSE:To achieve baking of a vacuum housing without providing an exclusive heater and the power supply especially in a gas chromatograph/mass spectroscope. CONSTITUTION:A vacuum housing 8 of a mass-analysis meter 2 is formed by a material with an improved thermal conductivity such as an aluminum alloy and a copper alloy, power supply portions 16, 18, and 20 are constituted on an outer wall of this vacuum housing 8 and at the same time circuit elements 16a, 18a, and 20a which become heat build-up sources are mounted in adhesion, the circuit elements 16a, 18a, and 20a operate as heat build-up sources for baking for the vacuum housing 8, and then the vacuum housing 8 operates as a radiator for cooling.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to gas chromatograph/
The present invention relates to mass spectrometers, and particularly relates to techniques for baking a vacuum housing of a mass spectrometer and dissipating heat from a heating element in a power supply section.

0002

2. Description of the Related Art A conventional gas chromatograph/mass spectrometer has the configuration shown in FIG. In the figure, numeral 1 is a gas chromatograph that separates sample gas into components;
is a mass spectrometer that separates the ions of each component gas separated by the gas chromatograph 1, 4 is an interface connecting the gas chromatograph 1 and the mass spectrometer, and 6 is a PFT.
This is a standard sample introduction part for introducing standard samples such as BA.

The mass spectrometer 2 described above has a vacuum housing 8
This vacuum housing 8 includes an ion source 10 that ionizes the component gases, a mass separation section 12 that separates the ions of each component from this ion source 10 by mass, and ions that are mass separated by the mass separation section 12. A detector such as a secondary electron multiplier tube for detecting ions is arranged together with the ion source 10 and the mass separator 1 outside the vacuum housing 8.
2. A power supply section 16 that supplies power to each of the detectors 14,
Further, a heater 22 for baking the vacuum housing 8 is closely attached to the outer wall of the vacuum housing 8, and a dedicated power source 24 is connected to the heater 22. .

The reason why the vacuum housing 8 is provided with a heater 22 for baking is as follows.

The inner wall of the vacuum housing 8 tends to adsorb the standard sample introduced to adjust the measurement system before analysis, the solvent flowing from the gas chromatograph, or the remainder of the sample gas. If present, it becomes a background during analysis and deteriorates detection sensitivity. Therefore, the vacuum housing 8 is constantly baked with the heater 22 to prevent adsorption of gas components. In this case, the baking temperature is set to 1, taking into consideration the heat resistance of the vacuum seal O-ring.
The temperature is set below 00℃.

On the other hand, each power supply unit 16, 18, 20 has circuit elements 16a, 18a, 20a such as power transistors, and these circuit elements 16a, 18a, 20a
Since heat is generated from each circuit element 16a, 18a,
Radiators 16b, 18b, and 20b are provided adjacent to 20a to dissipate heat.

[0007]

As described above, in the conventional apparatus, the heater 2 for baking the vacuum housing 8 is
2 and its power source 24, and the power source section 16 of the mass spectrometer 2,
Radiators 16b, 18b, and 20b for dissipating heat from the 18 and 20 circuit elements 16a, 18a, and 20a are provided separately and independently, which increases the number of parts in the entire device and increases the cost. However, there were other problems, such as high power consumption and the inability to miniaturize the device.

[0008]

[Means for Solving the Problems] The present invention has been made in order to solve the above-mentioned problems, and it is possible to bake a vacuum housing without the need for a dedicated heater or its power source as in the past. This enables the number of parts in the device to be reduced, wasteful power consumption, and miniaturization of the device.

Therefore, the present invention includes a gas chromatograph that separates the components of a sample gas, and a mass spectrometer that mass-separates the ions of each component gas separated by the gas chromatograph. This vacuum housing includes an ion source that ionizes the component gases, a mass separation section that mass-separates the ions of each component gas from the ion source, and a detector that detects the ions that have been mass-separated by the mass separation section. A gas chromatograph/mass spectrometer is provided with a power supply section that supplies power to the ion source, mass separation section, and detector, respectively, on the outside of the vacuum housing. take.

That is, in the present invention, the vacuum housing is formed of a material with excellent thermal conductivity such as an aluminum alloy or a copper alloy, and on the outer wall of the vacuum housing, a circuit element that constitutes a power supply section and is a heat source is installed. are attached closely together.

[0011]

[Operation] In the above structure, the circuit elements constituting the power supply section act as a heat source for baking for the vacuum housing.

On the other hand, for the above-mentioned circuit elements, the vacuum housing acts as a radiator for heat radiation.

[0013] Therefore, a conventional heater and its power source are not required.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram showing the overall configuration of a gas chromatograph/mass spectrometer according to an embodiment of the present invention, and parts corresponding to those of the conventional example shown in FIG. 2 are given the same reference numerals.

In FIG. 1, 1 is a gas chromatograph;
2 is a mass spectrometer, 4 is an interface, 6 is a standard sample introduction part, 8 is a vacuum housing, 10 is an ion source, 12 is a mass separation part, 14 is a detector, 16, 18, 20 are each power supply, and these The basic configuration is the same as in the conventional example.

The feature of this embodiment is that the vacuum housing 8 is made of a material with excellent thermal conductivity such as aluminum alloy or copper alloy, and the power supply unit 1 is provided on the outer wall of the vacuum housing 8.
Circuit elements 16a, 18a, 20a such as power transistors that constitute the circuits 6, 18, 20 and serve as heat sources are attached in close contact with each other, and each circuit element 16a, 18a
, 20a and the remaining circuit elements of the power supply sections 16, 18, 20 (
(not shown) are connected to each other by a cable 22.

In the above configuration, the circuit elements 16a, 18a, 20a constituting the power supply units 16, 18, 20 act as heat sources for baking the vacuum housing 8.

On the other hand, the above circuit elements 16a, 18a, 2
For Oa, the vacuum housing 8 acts as a radiator for heat dissipation.

[0019] Therefore, conventional heaters and their power supplies are no longer necessary.

[0020]

[Effects of the Invention] According to the present invention, it is possible to bake a vacuum housing without having to provide a dedicated heater or its power source as in the past, so the number of parts in the device is reduced, and unnecessary parts are saved. In addition to reducing power consumption, the amount of heat generated by the device can also be reduced. Moreover, excellent practical effects such as miniaturization of the device can be achieved.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the overall configuration of a gas chromatograph/mass spectrometer according to an embodiment of the present invention.

FIG. 2 is a block diagram showing the overall configuration of a conventional gas chromatograph/mass spectrometer.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1... Gas chromatograph, 2... Mass spectrometer, 8... Vacuum housing, 10... Ion source, 12... Mass separation part, 14...
Detector, 16, 18, 20...Power supply section, 16a, 18a,
20a...Circuit element.

Claims (1)

[Claims] Claim 1: A gas chromatograph (1) for separating the components of a sample gas, and a mass spectrometer (1) for mass-separating the ions of each component gas separated by the gas chromatograph (1).
2), this mass spectrometer (2) has a vacuum housing (8), and in this vacuum housing (8), an ion source (10) for ionizing a component gas, this ion source (
A mass separation unit (12) for mass-separating the ions of each component gas from the gas separation unit (10) and a detector (14) for detecting the ions mass-separated by the mass separation unit (12) are both disposed, while the vacuum The ion source (10), the mass separator (12), and the detector (
power supply units (16), (14) respectively supplying power to the
8), gas chromatograph equipped with (20)/
In the mass spectrometer, the vacuum housing (8) includes:
The vacuum housing (8) is made of a material with excellent thermal conductivity such as an aluminum alloy or a copper alloy, and the power supply parts (16), (18), and (20) are formed on the outer wall of the vacuum housing (8) and also serves as a heat source. A gas chromatograph/mass spectrometer characterized in that circuit elements (16a), (18a), and (20a) are closely attached.